在二维WSeNH中,大山谷分裂和空隙引起的山谷极化
Ziqi Wang1, Xuening Han1, Yan Liang1
1College of Physics and Optoelectronic Engineering, Faculty of Information Science and Engineering, Ocean University of China, Qingdao 266100, People's Republic of China. yliang.phy@ouc.edu.cn.
Physical chemistry chemical physics : PCCP
|June 7, 2024
概括
我们确定WSeNH是一种新的2D valleytronic材料. 它表现出显著的山谷分裂和两极分化,可以根据应变和空缺调节,推进山谷电子研究.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 量子力学就是量子力学.
背景情况:
- 一个新兴领域的 Valleytronics 使用电子伪旋转来处理信息.
- 二维 (2D) 半导体是开发新型电子和自旋电子设备的关键材料.
- 有效地操纵山谷伪旋转对于推进valleytronic应用至关重要.
研究的目的:
- 为了研究WSeNH单层作为二维valleytronic材料的潜力.
- 探索WSeNH中谷区分裂和两极分化的机制.
- 通过外部刺激来评估这些属性的可调性.
主要方法:
- 使用第一原则计算来研究WSeNH的电子和磁性.
- 密度函数理论 (DFT) 用于分析带结构和旋转轨道合.
- 模拟了压力和空缺对山谷物质的影响.
主要成果:
- 单层WSeNH表现出半导体行为,反向对称性被打破,K/K'谷不相等.
- 由于来自W-d轨道的强烈自旋轨道合,观察到425 meV的大谷分裂.
- 谷间分裂和光学过渡能量可以通过外部应变进行调整.
- 缺水导致23 meV的山谷极化.
结论:
- WSeNH 是一个有前途的候选 2D valleytronic 应用.
- 该材料提供了显著的山谷分裂和极化,可通过应变和空隙控制.
- 这些发现扩大了二维valleytronic材料的库,并提供了新的操纵策略.
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